Compound engine.



Patented mar. 2s, 190|.

S. M. VAUCLAIN.

CUMPUUND ENGINE.

[Application 61ml Nov. 2, 1900.)

2 Sheets Sheet l.

(No Model.)

ANI

N0. 670,745. v Patented Mar. 26, 190|. S. M. VAUCLAIN.

CMPDUND ENGINE.

Applimion mea Nav. 2, 1900.)

(No Model.) 2 Sheds-Sheet 2.

ma mams PETERS coy PnoTaLlmo.. WASHINGTON. n. c.

UN/ire Prion.

SAMUEL M. VAUCLAIN, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO BURNHAM,WVILLIAMS & COMPANY, OF SAME PLACE.

COMPOUND ENGINE.

SZPECIFICATION forming part of Letters Patent No. 670,745, dated March26, 1901.

Application filed November 2, 1900. Serial No. 35,229. (No model.)

To @ZZ whom it may cm1/cern:

Beit known that I, SAMUEL M. VAUCLAIN, a citizen of the United States,residingin Philadelphia, Pennsylvania, have invented certainImprovementsin Compound Engines,of which the following is aspecification.

My invention relates to certain improvements in compound engines,particularly of the locomotive type, in which two cylinders Io arearranged at each side of the locomotive.

The object of my invention is to so construct an engine of this typethat the piston of one cylinder will move forward while the other isreturning, using a singleV valve to control the passage of steam to boththe high and low pressure cylinders.

In the accompanying drawings, Figure l is a side View, partly insection, of suflicient of a locomotive-engine to illustrate my invenzotion. Fig. 2 is a plan view showing one-half of the driving-gear of alocomotive. Fig. 3 is a transverse sectional View on the line 3 3, Fig.2. Fig. 4 is a longitudinal sectional View on the line 4 4, Fig. 2; andFig. 5 is a sectional view of one form of valve used with my improvedengine.

A is the frame of a locomotive.

B B are the two cylinder-castings forming the saddle.

B B are the high-pressure cylinders, and B2 B2 are the'low-pressurecylinders. In the present instance each casting B contains a high and alow pressure cylinder.

C is the piston of the high-pressure cylinder, having a rod C', whichpasses through a stuflng-box in the head of the cylinder and is securedto a cross-head C2 at its outer end. This cross-head slides in guides cc, Figs. 2 and 4. I

D is the piston of the low-pressure cylinder, having a rod D extendingthrough a stuii'ing-box in the head of the cylinder and secured to across-head D2, arranged to slide on guides d CZ, Figs. l and 2. EE arethe driving-axles, mounted in boxes fitted to the frame A.

F F are the driving-wheels, mounted on the axles E E. On each wheel is acrank-pin e e', respectively, and Gis a parallel rod mount- 5o ed on thepins e c'. The pin c' is extended,

and a connecting-rod H, pivoted to the crosshead D2 at d', is coupled tothe pin e', as shown.

The driving-axle E has two cranks E2, one on each side of the center ofthe locomotive, and each crank is coupled to a cross-head C2 of one ofthe high-pressure pistons by a connecting-rod I being pivoted to thecross-head 3.13 0

J is the valve-chest common to both the highandlowpressurecyliuders. Inthechest is a valve J', having a rod j attached to the valve-gear of theengine. The valve-chest and valve illustrated are described and claimedin a companion application filed by me of even date herewith, andtherefore need not be de scribed in detail in this application.

'lhe valve-chest J is formed in the cylinder-casting B and in thepresent instance is above the cylinders, and the ports l and 2, leadingto the high-pressure cylinder B', and the ports 3 and 4, leading tothelow-pressure cylinder B2, are direct. A central steamsupply port 5 isprovided, as well as a central exhaust-passage 6, communicating with theports 7 7.

By the above description it will be seen that a single valve controlsthe passage of steam to both the high and low pressure cylinders on oneside ofthe locomotive, and the valve can be operated by a plainvalve-gear. One of the pistons is connected toa crank on one of theaxles, and the other piston is connected to one of the driving-wheels,making a very simple construction.

I claim as my inventionl. The combination of high and low pressurecylinders, a pistonv and piston-rod for each cylinder, twodriving-axles, connections between one of the piston-rods and one ofsaid axles and other connections between the second piston-rod and theother axle, said connections being so arranged that the high pressurepiston travels in a direction opposite to that of the low-pressurepiston, and a single valve common to both cylinders, the long axes ofsaid cylinders being in parallel vertical planes, substantially asdescribed.

2. The combination of high and low pressure cylinders, a piston andpiston-rod for each cylinder, a cross-head at the outer end of each rod,guides for the said cross-head, a`

IOO

nection between one of said cross-heads and the driving-shaft,connections between the second cross-head and a crank on thedrivingwheel, said connections being made on opposite sides of theWheel, a valve-chest common to both cylinders, and a valve within thesaid chest, said cylinders being so arranged that their long axes are inthe same horizontal plane, substantially as described.

3. The combination of high and loW pressure cylinders so arranged thattheir long axes are in the same horizontal plane, a piston and pistonrod for each cylinder, a single valve for supplying steam to the twocylinders, cross-heads connected to the said rods, guides therefor, acranked driving-axle having a Wheel, a crank-pin on said Wheel, a rodconnecting the crosshead of one piston to the crank of one shaft, and arod connecting the cross-head of the other piston to the crank-V pin ofthe wheel, substantially as described.

4. The combination in a compound locomotive, of a saddle consisting oftwo castings, each casting having a high and low pressure cylindertherein, a single valve-chest common to the cylinders of each casting, avalve therein, opposite side frames for the engine, one cylinder of eachpair being on the inner side of its side frame and lthe other cylinderof the pair on the outer side thereof, a crank-axle, a driving-wheel onthe outer side of the frame, the crank of the axle being on the innerside of the same, a rod connecting one piston-rod to the crank-axle, anda rod connecting the other piston-rod to the crank-pin on the Wheel,substantially as described.

5. The combination in a locomotive-engine, of the frame of thelocoxnotive,a saddle consist ing of two castings each casting ha ving ahigh and low pressure cylinder and a valve-chest therein, saidvalve-chest being common to the cylinders of each pair, thehigh-pressure cy linders being on the inside of the frame and rthelow-pressure cylinders being on the outside of the frame, a crankeddriving-aXle, driving-wheels on said axle and on the outer side of theframe,- rods connecting the pistonrods of the high-pressure cylinders tothe cranks of the cran k-aXle, and rods connecting the piston-rodsof thelow-pressure cylinders to the crank-pins of driving-Wheels,substantially as described.

In testimony whereof lI have signed my name to this speciiicaton in thepresence of two subscribing witnesses.

, SAMUELM. VAUCLAIN.

Witnesses:

WILLIAM DE KRAFFT, JAS. H. M. HAYES.

